I have recently COMPLETELY overhauled the entire electrical system on my 2000 225 Ficht, the immediate predecessor of the ETEC with a very similar EMM/PDP fuse block/relay component system. There are three i-harness diodes to ensure polarity during EMM switching, mostly of ground circuitry. The PDP has a number of on-board diodes for current flow control, and one MOV (varistor) to control voltage spikes and surges.Due to the dual voltage production of the Stator, these components are even more essential. In my case after being advised to replace the EMM, I discovered a hairline crack in the PDP PCB conductive compound which probably caused all of the "three light salute" lockouts issues. I posted photos and additional details on this blog-site, check it out. Long story short, the electronics are easily compromised by overheating, poor maintenance and rough conditions, and if the if a diode fails, it causes a sequence of somewhat catastrophic failures. Most techs and owners have not the skill level to diagnose or repair these types of failures. The diodes should be replaced on routine basis as they are in vulnerable spots frequently exposed to extreme heat and moisture which are both detrimental to these small electronics. Generics are readily available and can easily be substituted for the exorbitantly priced OMC/Evinrude parts. Add heat shrink tubing in multiple layers to properly insulate and add silicone sealant if you want for added protection.
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